[c-nsp] MPLS Header

sthaug at nethelp.no sthaug at nethelp.no
Tue May 12 07:55:40 EDT 2009

> if i have POS interface (STM-1 link) and i enabled MPLS on it 
> how much header i will lose from the overall capacity (155.52 M)
> and how the interface type will affect on the size ?

MPLS labels are 4 bytes each. You typically need 2 labels, thus 8
bytes. There are situations where you might need 3 labels, seldom

What percentage this is of the total capacity depends on packet size.
If you have to worry about it, it may mean you're doing something wrong.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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